Akademik

1. Not possessed of a spinal or vertebral column. 2. Any animal that has no spinal column.

in·ver·te·brate (')in-'vərt-ə-brət, -.brāt n an animal having no backbone or internal skeleton

invertebrate adj lacking a spinal column also of or relating to invertebrate animals

1. n. an animal without a backbone. The following are invertebrate groups of medical importance: insect, tick, nematode, fluke, and tapeworm.

2. adj. not possessing a backbone.